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To deeply and uncontrolably miss something or someone, usually a man/woman or a drug.
Baby, I've been fiening for you all day!
Man you need to pass that shit, I'm fiening like a motha fucka over here.
by Nikki D. June 15, 2007
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obsessing over someone you used to like or like and cant have that person
yo im fiening over Jose
Fabian keeps texting me he really fiening
via giphy
by @bluntswit June 08, 2017
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